Documents of the Senate of the State of New York Volume 40, PT. 6

Description

This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1905 edition. Excerpt: ...all appear to spring at once from the center, and that the "funicle " of other Dichograptidae is hardly noticeable. This concentration of branching of the rhabdosome in the early stages, causing a bushlike mode of branching pl.2, fig.13, 14, 16 is the only difi'erence which the writer can find between Clonograptus and Clematograptus, and it is quite probable that this is of no more than subgeneric importance. As, however, the latter genus hasbeen commonly recognized and comprises a small group of forms which is well characterized by the feature mentioned, we will distinguish it here also though under the older term Staurograptus. Bryograptus patens Ruedemann. Ibid. 1903. p.938 Bryograptus lentus Ruedemann. Ibid. 1903. p.938 Description. Rhabdosome broadly conical to saucer shaped; mostly found vertically compressed or spread out. Sicula short (about 1.8 mm long) and slender conical, suspended by means of a delicate nema, which attains four times the length of the sicula and has not been observed in grown specimens, from a chitinous disk that in diameter approximately equals the length of the sicula pl.2, fig.1. Primary thecae ("funicle") growing in direction of the sicula, rhabdosome hence apparently beginning with four or more branches. Rhabdosome attaining a diameter of 40 mm, consisting of numerous (upward of 40) branches of the last order. Branches slender 1 Figure 40 appears tometo represent anearly growth stage of Die t yonema f label liforme (about.4 mm wide in the dorsal aspect and.6 mm in the lateral aspect), straight in the central parts and slightly flexuous in the distal region, branching dichotomously inbirregular intervals. Branches of six orders observed; the bifurcation of the first branches takes...show more